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UNITED STATES PATENT OFFICE( GEORGE W. MORRIS, OF CHIGAGO, ILLINOIS, AND GEORGE PRESGOTT,

OF ST. LOUIS, MISSOURL CAR-SPRING.

SPECIFICATION forniing part of Letters Patent No. 265,852, dated October 10, 188".

Application filed August 528, 1882. (No model.) I

Our invention relates to improvenents in graduated bolster-springs for railway-cars, in which spirally-coiled springs are placed one within the other and acted on in succession to bring all the spirals into action under a given pressure. In such springs the graduation has been effected by long and short spi'ally-coiled bars for the purpose ot' sniting the light and heavy weight of a railroadcar. We efi'ect the graduation with spirally-coiled bars ot' equal length combined with a seat-plate adapted to allow of the d'opping down of' the inner spring to bring it below the height ot'the outer spring, so that the latter will receive the weight of the car-body, and when the car is loaded the inner spring will be brought into action. By having the springs ot' the same length and graduating them in the seat-plate we avoid the ne- .cessity oi' having to make long and short springs for the purpose, and produce a graduated spring` from springs of the same height now sold, such as the French spiral springs. e drop down the inner spring, because it is the lightest and snallest in diameter and more liable to break, so that it is only brought into action under heavy leads.

The acconpanying drawing shows a vertical sectional View of a graduated car-spring embracing our improvement.

The springs are ofthe same length and placed one within the other, the outer one, u, being always in action, and the inner one, b, dropped down into a recess, c, in the seatplate, so as to bring its upper end about three-eighths of an inch below the upper end ot' the outer spring,

and only brought into action when the cars are loaded. At all other times the inner spring is at rest. W'e may use two or more inner springs, and let them down successively in the seat-plate below the level of the outer one; but all must be of the same length, the bottom oi' the inner spring or springsbeing always below the botton' of the outer spring and the top of the latter above the top of the inner spring or springs under light loads. The seat-plate has separate seats c d for the springs, one below the other, the inner one, c, being the deepest, and the difference in their depths being equal to the difference ot' the heigbtof the outer spring above the inner one. The seatplate has a raised center, e, and a circunferential raised fiange,f, while a cap-plate, g, rests upon the outer spring and has adepressed center, h,extending within the inner spring, and is secured to the seat-pla-te by a screw-bolt, i, passing up through the inner spring, and a nut-,j, screwed upon the bolt within the sunkeu center of the cap, whereby the seat-plate and the I GEO. \V. MORRIS. GEO. W. PRESCOTT.

Witnesses:

F. D. THoMAsoN, S. S. SCHOFF, 'W. C. DAYTON,

1). W. MITCHELL. 

